Freestanding polyimide fiber network as thermally safer separator for high-performance Li metal batteries

Rodríguez, Jassiel R.; Jokhakar, Deep; Rao, Harsha; Lin, Keng Wei; Lo, Chieh Tsung; Aguirre, Sandra B.; Pol, Vilas G.

doi:10.1016/j.electacta.2021.138069

Cited by 16 publications

(6 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[34][35][36][37][38] With the combination of the electrospinning technique, nanofibrous membranes based on PI are endowed with high porosity and excellent electrolyte wettability, which contribute to largely improved battery performance. [39][40][41][42][43][44][45][46] However, high porosity of electrospun nanofibrous separators is usually accompanied by poor mechanical strength. Meanwhile, the large pore size of the separators with uneven distribution could lead to dendrite growth and soft short circuit inside batteries, which severely hinder large-scale applications of electrospun nanofibrous separators.…”

Section: Introductionmentioning

confidence: 99%

A Fluorinated‐Polyimide‐Based Composite Nanofibrous Separator with Homogenized Pore Size for Wide‐Temperature Lithium Metal Batteries

et al. 2023

View full text Add to dashboard Cite

Lithium (Li) is known for excellent theoretical specific capacity and most negative electrochemical potential, while still restricted by the irregular lithium dendrites and safety risks in practical applications of lithium metal batteries (LMBs) due to thermal runaway. Herein, a fluorinated‐polyimide (F‐PI)‐based composite nanofibrous separator containing poly(vinylidene fluoride) (PVDF) component, which is designed as PVDF/F‐PI, is developed via a facile electrospinning strategy for wide‐temperature LMBs. First, abundant polar trifluoromethyl (–CF3) groups in F‐PI create an electronegative environment to facilitate rapid Li‐ions (Li+) transport. Meanwhile, the PVDF component, acting as both the physical linker between F‐PI nanofibers and the regulator of homogenized pore size, simultaneously improves the mechanical properties and homogenizes the Li+ flux on the electrode surface. Therefore, a steady circulation of 2400 h is achieved for the symmetric cell using PVDF/F‐PI separator, which still displays a stable cycle life with a low voltage polarization of 15 mV in 1000 h even under 60 °C. Therefore, the fluorinated‐PI‐based composite nanofibrous separator with high ionic conductivity and uniform pore structure offers a practical method for design of functionalized separators in wide‐temperature LMB applications.

show abstract

Section: Introductionmentioning

confidence: 99%

A Fluorinated‐Polyimide‐Based Composite Nanofibrous Separator with Homogenized Pore Size for Wide‐Temperature Lithium Metal Batteries

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The polarization degree of the battery is evaluated by analyzing the differential voltage of the charge-discharge platform. 50 Figure 7b presents the charge-discharge platform curves of the first cycle and the 200th cycle. It can be observed from the Figure 7b that more serious polarization issues were observed in the cells with PE separator due to the increase of the ohmic polarization effect.…”

Section: Electrochemical Performance Characterization Of Separatormentioning

confidence: 99%

Polydopamine‐assisted in situ formation of dense aramid nanofibers layer on polyethylene separator for lithium‐ion battery

Cheng,

Qian,

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

Herein, we report a modified polyethylene (PE) separators via in situ polymerization of polydopamine (PDA) and coating of dense aramid nanofibers (ANFs) on the surface of PE separator. Due to the unique hydrophilic performance and cooperative effect of PDA and ANFs, the wettability and migration ability of lithium ion of the modified PE separator were obviously enhanced. Moreover, the modified PE separator have the lower thermal shrinkage, the higher melting temperature and decomposition temperature, and excellently electrolyte wettability than pristine PE separators. The capacity of the modified PE separator remains 140.29 mAh g−1 after 200 cycles at 1.0°C, and the coulombic efficiency also maintain more than 78.86%. In addition, the modified PE separator exhibits a higher lithium‐ion transfer number, outstanding ionic conductivity (2.390 × 10−4 S/cm) and small interfacial resistance (−83.85 Ω) due to its excellently electrochemical properties. Thus, the modified PE separator has great potential to fabricate the high quality separator materials for designing and developing lithium‐ion batteries.

show abstract

“…Fibrous membrane fabricated by nonwoven technology has superior porosity, and can realize its thermoresistance through the choice of materials, thus being considered as development trend of power battery separator in the future (E. Wang, Chiu, & Chou, 2020). So far, some types of high performance engineering plastic have been widely employed to prepare nonwoven fabric, for example polyphenylene sul de (J. , polyimide (Rodriguez et al, 2021) and aramid (C. . However, there are some shortcomings including high cost, complicated manufacture process and poor wettability belonged to these synthetic polymers.…”

Section: Introductionmentioning

confidence: 99%

Tissue paper-based composite separator using nano-SiO2 hybrid crosslinked polymer electrolyte as coating layer for lithium ion battery with superior security and cycle stability

Zeng

Liu

et al. 2022

Cellulose

View full text Add to dashboard Cite

With the development of energy-storage devices, separator is encountered by several challenges including adequate safety, higher current density and superior stability. Tissue paper, composed of packed cellulose bers, possesses lower production cost, more easily accessibility, superior wettability and outstanding thermostability, thus being prospective as a substrate of high performance separator. To address structure collapse phenomenon occurred in conventional coating layer after long term electrolyte swelling, nano-SiO 2 hybrid crosslinked network was constructed on tissue paper through chemical reactions between polymer poly (vinylidene uoride-co-hexa uoropropylene) (PVDF-HFP) and hyperbranched polyethyleneimine (PEI) in this work. The in uences of crosslinking degree on physical properties and electrochemical performance were studied thoroughly. It can be found that when the crosslinking ratio of PVDF-HFP and PEI xed at 10:1, the crosslinked composite separator displays excellent electrolyte uptake and wettability, superior ionic conductivity, better interfacial compatibility as well as higher Li + transference number (0.56), thus offering battery with prominent rate capabilities.Besides, this crosslinked composite separator exhibits satisfying dimensional stability even treated at 250 o C, better ame retardancy, enhanced mechanical behavior, wider electrochemical window and outstanding cycle stability. Accordingly, tissue paper-based crosslinked composite separator can meet higher requirements put forward by high power lithium ion battery. HighlightsTissue paper was employed to fabricate lithium ion battery separator.Nano-SiO 2 hybrid crosslinked polymer electrolyte was constructed to modify tissue paper.The composite separator gave superior electrochemical performance and prominent rate capabilities.The designed coating layer was con rmed to increase mechanical strength, broaden electrochemical window and maintain cycle stability obviously.Excellent thermal stability and certain self-extinguishing were obtained for composite separator to afford security.

show abstract

Freestanding polyimide fiber network as thermally safer separator for high-performance Li metal batteries

Cited by 16 publications

References 35 publications

A Fluorinated‐Polyimide‐Based Composite Nanofibrous Separator with Homogenized Pore Size for Wide‐Temperature Lithium Metal Batteries

A Fluorinated‐Polyimide‐Based Composite Nanofibrous Separator with Homogenized Pore Size for Wide‐Temperature Lithium Metal Batteries

Polydopamine‐assisted in situ formation of dense aramid nanofibers layer on polyethylene separator for lithium‐ion battery

Tissue paper-based composite separator using nano-SiO2 hybrid crosslinked polymer electrolyte as coating layer for lithium ion battery with superior security and cycle stability

Contact Info

Product

Resources

About